Helium is found in the gas system known as the universe's cosmic gas system, specifically in stars and the universe's interstellar medium. Helium is a noble gas that is produced through nuclear fusion in stars, including our sun. On Earth, it is primarily obtained from natural gas reserves. Helium is lighter than air and is used in various applications, including filling balloons, as a coolant for MRI machines, and in scientific research. Its non-reactive nature makes it ideal for many applications requiring an inert atmosphere.